Add ExtractXcoordinateFromEcPublicKey() method

			/**

        	 * @desc	Extract X-Coordinate from EC public key

        	 * @param	p_publicKey EC public key as returned by fx_extractPublicKey

        	 * @param	p_publicKey EC public key

        	 * @return	X-Coordinate of EC public key

        	 */           

			external function fx_extractXcoordinateFromEcPublicKey(in octetstring p_ecPublicKey) return octetstring;